The picture shows the ground weather map of an area in July (unit: hectopascals). Look at the map and answer questions 24-25. In the following four pictures, it is close to ①→②actual weather.

There is a cold front between A, ① and ②. ① Controlled by high warm air mass; (2) controlled by a cold air mass, which does not meet the meaning of the question.

B, ① controlled by the heating air mass, with high temperature and low air pressure; ② It is controlled by the cold air mass, with low temperature and high air pressure, located in the middle near the front, with rapid cooling and low air pressure, so it is correct;

C, the isobar at ① is thinner than that at ②, and the wind speed at ① is less than ②, which does not meet the question.

D, ① and ② are controlled by a single air mass, and the weather is clear, the cloud amount is small, it is rainy near the front, and the cloud amount is large, which does not meet the question.

Therefore, choose: B.